21161452 has 12 divisors (see below), whose sum is σ = 39881296. Its totient is φ = 9766800.

The previous prime is 21161443. The next prime is 21161467. The reversal of 21161452 is 25416112.

It is an unprimeable number.

It is a pernicious number, because its binary representation contains a prime number (13) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 203424 + ... + 203527.

Almost surely, 2^21161452 is an apocalyptic number.

It is an amenable number.

21161452 is a deficient number, since it is larger than the sum of its proper divisors (18719844).

21161452 is a wasteful number, since it uses less digits than its factorization.

21161452 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 406968 (or 406966 counting only the distinct ones).

The product of its digits is 480, while the sum is 22.

The square root of 21161452 is about 4600.1578233795. The cubic root of 21161452 is about 276.5976512100.

Adding to 21161452 its reverse (25416112), we get a palindrome (46577564).

The spelling of 21161452 in words is "twenty-one million, one hundred sixty-one thousand, four hundred fifty-two".